Cast-iron head wall



July 20 1926.

D. 23. DIMICK CAST IRON HEAD WALL 1925 2 Sheets-Sheet l Filed Nov. 19

July 20 1926. 1,593,488

D. B. DIMICK CAST IRON HEAD WALL Filed Nov. 19, 1925 2 Sheets-Sheet '2 July 20, 1926.

warren stars,

DANIEL BAKER DIMICK, OF BIEMIYGTEIAM, ALABAMA,

CAST-IRON HEAD W'ALL.

The present invention relates to improvements in headwalls for culverts and has for an object to provide an improved headwall constructed with a view to the elimination a of delays in installation due to weather conditions, and subject to a low costdue to quantity production, a low transportation cost to the culvert site, and to a low labor cost in the installation.

u Another object of the invention is to proin strength and made up of interlocking parts whereby to give freedom from casting strains, the elimination of breakage during transportation and to secure ease of handling in the field.

lVith the foregoing and other objects in view, theinvention will be more fully de scribed hereinafter, and will be more par ticularly pointed out in the claims appended hereto.

In the drawings, wherein like symbols refer to like or corresponding parts through out the several views,

Figure 1 is a side View of two of the improved headwalls with a spiral corrugated pipe extending between them.

Figure 2 is a front view of the improved headwall,

Figure 3 is a similar view showinga slight modification.

Figure a is a top plan view of the improved headwall taken on an enlarged scale and showing portion broken away.

Figure 5 is a vertical section taken on the line 5-5 in Figure 1.

Figure 6 is a vertical section taken trans versely through the center of the device shown in Figure 2.

Figure? is a similar view rith the locking ring removed, and V F ure 8 is a separate. section taken through a modified form of the locking ring. V

Referring moreparticularly to the drawings the improved headwall is constructed cr'the back wall 9, side aprons 10 and 11, the hot-tom apron and some means, for

Application filed Iloveniber 19,

1925. Serial no. 70,092.

instance the locking ring 13, for securing the headwall on to the culvert pipe, a form of which culvert pipe is indicated by the dotted line 14 in Figure 1.

All of these parts are preferably, though not necessarily, constructed of cast iron. I prefer recast pig iron as this material is but little affected by water corrosion. It is not decomposed by rust when subjected to any weather conditions for years, even for centuries; nor is it affected by temperature changes rrom sub-zero weather to the ten1- perature of the tropics. Therefore, recast. pig iron is particularly adapted as a urit rial of construction in cases where the ucturc must withstand the ravages of time and weather. The strength of recast pig iron is well known and constant under all conditions, and this property recommends it particularly for headwalls for culverts which must not only withstand changes in temperature, exposure to' all the elements of nature, but also be of such strength as to hold the earth pressure of the supported grade. .Recast pig iron has been found to be an ideal material for this purpose.

In the use of cast iron, however, the reduction of weight is important, while the conditions to which a headwall is subjected require a unitary construction. These oh jects are secured by the separate manufacture of the parts 9, 10, 11, 12 and 13 with provision to interlock such parts, whereby all casting strains and strains set up by expansion and contraction due to temperature changes are eliminated. 1th the parts made up separately, each part may be of a selected weight and size as to be easily transported and handled in the fieldv This feature eliminates the necessity of special rigging for handling or placing the headwall, reduces labor costs and allows the headwall to be transported wherever man himself may go. The elimination of breakage, both in rail road transportation and the field, is of great importance.

With the cast iron headwall made up of the separate and interlocking parts referred to installation and labor costs are reduced and 2 means-s beaded outer edge or rim 14 and is adapted to be erected vertically at an end of the culvert pipe. There is a central opening 15 (indicated in Figure 6) through which the .lock ring 13 may pass. This lock ring is provided with the out-turned flange 16 adapted to engage against the front face of the back wall 9. The lock ring 13 is for the purpose of engaging the culvert pipe while the flange 16 holds the back wall 9 in place on the pipe and prevents dismemberment of the unitary headwall or its disengagement from the culvert pipe. The lock ring 13 may be provided with the internal corrugations to fit a spiral corrugated cast iron pipe constructed according to my prior Patent No. 1,544,057, granted June 30,

This pipe is made in two sizes to admit of its threading together and the lock ring 13 is preferably made with an internal spirally ribbed diameter 17 of a large size to fit the larger or cuff section of pipe. The ring 13 is also made with the spirally ribbed smaller section 18 to fit the normal pipe.

In Figure 8 the locking ring 13 is generally of the same type as the locking ring 13 in Figure 6 except that instead of providing spiral corrugations or ribs internally of such ring, the lugs 19 are provided to cooperate with similar lugs on lock joint pipe.

The back wall 9 is provided with the upper pair of vertically elongated slots 20 and 21 disposed at opposite sides of its central opening and with the lower pair of elongated slots 22 and 23. The inner walls of these slots are reinforced by the beads as also extending vertically. The side apron 10 is provided with a pair of locking wings 25 extending at an acute angle from the rear vertical edge of saidapron and in position to enter the slots 20 and 22 in the back wall. These lugs are intended to lie flat against the rear surface of the back wall and in this position to require the apron 10 to assume a flaring relation to the back wall only.

The companion side apron 11 is similarly provided with the locking wings 26 adapted toenter the slots 21 and 23 of the back wall and to hold the side apron 11 in a divergent position with respect to the opposite side apron 10.

The bottom apron 12 is shaped to fit against the back wall 9 and the lower inner edges of the side aprons 10 and 11; and such side aprons are provided at their outer lower corners with the vertically spaced lugs 27 and 28 forming therebetween slots to receive the side edges of the bottom apron 12. The inner lower corners of the side apron 10 and 11 are provided with the single lugs 29 on which the rear edges ofthe bottom apron 12 may rest.

Some couplin means is also preferably provided to hold the bottom apron and the side aprons together. For purpose, at a convenient point in the side aprons are provided the T-shape'd slots 30 for receiving the double headed keys 31, the shanks of which The device is inserted in the following manner The back wall 9 is placed over the projecting end of the cast iron culvert pipe. The loci; ring 13 is then attached to the projecting end of the pipe and the back wall 9 drawn back against the flange 16 of the lock ring. The two side aprons 10 and 11 are then engaged with the back wall by inserting the interlocking wings into the slots in the back wall. Finally, the bottom apron 12 is slipped into place between the lower edges of the side aprons and the locking keys 31 being engaged with the side aprons and bottom apron, the parts are effectively locked in place and into a unitary headwall as the angular interlocking wings 25 and 26 of the side aprons will be prevented from escape through the slots in the back wall due to the'angular position at which the side aprons are maintained by the bottom apron 12 Earth fill is then placed and rammed behind the back wall 9 and side aprons 10 and 11 and under the bottom apron 12. The more earth pressure that is exerted against the surfaces of the headwall only serves to lock the component parts more tightly togetlier.

In Figure 7, the bottom apron 12 is provided with the front flange 34: and the side flanges to better hold the earth fill.

It is obvious that various changes and modifications may be made in the details of construction and design of the above specifically described embodiment of this invention without departing from the spirit thereof, such changes and modifications being restricted onlyby the scope of the fol lowing claims 2 What is claimed is:-

1. A cast iron knock down headwall C0111- prising a back wall, side aprons coupled detach-ably to said back wall and a bottom apron extending between the lower portions of said aprons and detachably secured thereto.

2. An improved headwall comprising a back wall adapted to extend about the culvert pipe and be secured thereto, divergent side aprons removably secured to said back wall, and a bottom apron coupled to said side aprons.

3. An'improved headwall comprising a back wall, means to hold said back wall to a culvert pipe, side aprons having means to interlock .ith said back wall, and a bottom apron coupled to said side aprons and for holding said side aprons apart.

4. An improved headwall comprising a back wall adapted to extend about a culvert pipe and be secured thereto, side aprons removably interlocked with said back wall, a bottom apron for spacing said side aprons in flaring position to avoid the disengagement of the interlocking connection with the back wall, and means for coupling said side aprons to said bottom apron.

5. An improved headwall comprising a cast back wall, east side aprons interlocked with the headwall in divergent position, and a cast bottom apron for holding said side aprons in divergent position.

6. An improved headwall comprising acastiron rear wall, cast iron side aprons interlocked with said back wall in the divergent position thereof, a cast iron bottom apron for holding said side aprons in divergent position, and cast iron releasable means for coupling said side aprons to the bottom apron.

7. A headwall comprising a perforated back wall, side aprons interlocked with said back wall, a bottom apron interlocked with said side aprons, and a lock ring engaging through the perforated back wall and interlocking therewith for securing said headwall to a culvert pipe.

8. An improved headwall comprising a perforated back wall, side aprons inter locked with said back wall, a bottom apron interlocked with said side aprons, and a ianged locking ring passing through the opening in the back wall -'ith its flange engaging against the back wall, said ring adapted to engage about a culvert pipe.

9. An improved headwall comprising a per' 'orated and slotted back wall, side aprons having interlockin wings projecting at substantially an acute angle therefron'i {or engaging in the slots of the back wall, a bottom apron coupled between said s 'e aprons, and ieans engaging through .1 back wall for uniting the headwall to a culvert pipe.

i0. An improved headwall comprising a back wall, side aprons coupled to said back wall and having lugs at their lower edges, and a bottom apron supported on the lugs of-said side aprons.

11. An improved headwall comprising a back wall, side aprons secured to said back wall, an-c having lugs at their lower edges, a bottom apron engaged with said lugs for holding the side aprons apart, and means between said side aprons and the bottom apron for interlocking said aprons.

DANIEL BAKnJR DIMICK. 

